bind_descriptor() [2/2]

template<typename T >

void MayaFlux::Buffers::FormaBindingsProcessor::bind_descriptor ( const std::string &  name, std::shared_ptr< Portal::Forma::MappedState< T > >  state, std::function< float(T)>  project, const std::string &  descriptor_name, uint32_t  binding_index, uint32_t  set, Portal::Graphics::DescriptorRole  role = Portal::Graphics::DescriptorRole::UNIFORM  )

inline

Bind a MappedState<T> to a descriptor binding on the attached buffer.

Creates an owned host-visible GPU buffer sized to sizeof(float). Each tick the projected value is uploaded into this buffer and registered in the attached buffer's descriptor_buffer_bindings, following the same path as DescriptorBindingsProcessor.

Parameters

name	Logical binding name.
state	MappedState whose value is read each graphics tick.
project	Projection from T to float. Called every tick.
descriptor_name	Descriptor name in the shader config.
binding_index	Vulkan binding index within the descriptor set.
set	Descriptor set index.
role	UNIFORM for UBO, STORAGE for SSBO.

Template Parameters

T	MappedState value type.

Definition at line 172 of file FormaBindingsProcessor.hpp.

    {
        if (!state) {
            MF_ERROR(Journal::Component::Buffers, Journal::Context::BufferProcessing,
                "FormaBindingsProcessor::bind_descriptor: null state for '{}'", name);
            return;
        }
 
        auto gpu_buf = make_descriptor_buffer(role);
 
        auto& b = m_bindings[name];
        b.kind = TargetKind::DESCRIPTOR;
        b.reader = [s = std::move(state), p = std::move(project)]() {
            return p(s->value);
        };
        b.pc.reset();
        b.desc = DescriptorTarget {
            .descriptor_name = descriptor_name,
            .set_index = set,
            .binding_index = binding_index,
            .role = role,
            .gpu_buffer = gpu_buf,
            .buffer_size = sizeof(float),
        };
 
        bind_buffer(descriptor_name, gpu_buf);
        m_needs_descriptor_rebuild = true;
 
        MF_DEBUG(Journal::Component::Buffers, Journal::Context::BufferProcessing,
            "FormaBindingsProcessor::bind_descriptor: '{}' -> descriptor '{}' set={} binding={}",
            name, descriptor_name, set, binding_index);
    }

References b, MayaFlux::Buffers::FormaBindingsProcessor::DescriptorTarget::descriptor_name, MF_DEBUG, and MF_ERROR.